<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>canvas</title>
</head>
<style>
    body{
        padding: 0;
        margin: 0;
    }
    #cvs{
        position: fixed;
        top: 0;
        left: 0;
        background: #222;
    }
</style>
<body>
    <canvas id="cvs"></canvas>
    <script src="./index.js"></script>
</body>
</html>